熱処理鋼の低速ねじり疲労変形に及ぼす組織の影響

概要

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In this report, the fatigue deformation of carbon steel as heat treated and the same followed by plastic twisting or torsional stress-aging were investigated and the effect of micro-structure on the fatigue deformation was studied. The results obtained are summarized as follows : (1) Static yield strength is nearly proportional to the fatigue yield strength, therefore, the former may be used as a measure of the latter. (2) The static yield strength, that is, the fatigue yield strength of the heat treated steel may be affected by the strength of ferrite itself, the magnitude of the mean ferrite path and the magnitude of the resistance against slip of ferrite caused by pre-straining or stress-aging. Hence, the effect of heat treatment, pre-straining and aging on the fatigue deformation may be explained in relation to the three factors mentioned above. (3) For heat treated steel, the torsional stress-aging is more useful for the prevention of fatigue deformation than cold-working. (4) In plastically twisted and torsional stress-aged steels the fatigue yield strength is smaller than the yield strength is static tests and the fatigue deformation increases as the mean stress decreases.
社団法人日本材料学会の論文
1961-04-15